* Bump API patch number and header version number to 55 for this update.
Github Issues:
* Removed unintended optional parameter in +vk.xml+ from the
pname:pWaitSemaphores member of slink:VkPresentInfoKHR, which resulted
in the generation of an incorrect implicit valid usage clause allowing
pname:pWaitSemaphores to be NULL even when pname:waitSemaphoreCount is
non-zero (public issue 491).
* Add missing attribute to +vk.xml+ documenting that
slink:VkSwapchainCounterCreateInfoEXT extends
slink:VkSwapchainCreateInfo (public issue 510).
* Add const qualifier for some `VK_EXT_debug_market` extension command
parameters that were missing it (public issue 513).
* Fix definition of q and level~base~ in
<<textures-image-level-selection,Image Level(s) Selection>> (public
issue 515).
* Clarify lifetime requirement for slink:VkRenderPass objects used in
object creation (public issue 516).
* Fix link to floating/normalized fixed-point conversion from
<<interfaces-fragmentoutput,Fragment Output Interface>> (public issue
521).
Internal Issues:
* Update the style guide to include the general structure of a Vulkan
command name, the specific rule for using "`Get`" vs. "`Enumerate`" in
names, and a table of verbs commonly used in command names (spinoff of
internal issue 753).
* Clarified the behavior of automatic layout transitions in case of
attachment views that are 2D or 2D array views of 3D images. In
addition, restructured the valid usage clauses corresponding to the
members of the slink:VkImageSubresourceRange structure and added missing
valid usage clauses for its pname:baseMipLevel and pname:baseArrayLayer
members (internal issues 803, 849).
* Modify `GL_KHR_vulkan_glsl` specification to allow explicit std430 on a
push_constant declaration (internal issue 919).
Other Commits:
* Modify <<synchronization-framebuffer-regions, Framebuffer Region
Dependencies>> to use synchronization scope terminology.
* Add ename:VK_COLOR_SPACE_EXTENDED_SRGB_NONLINEAR_EXT to the
`VK_EXT_swapchain_colorspace` extension.
* Replace XML comments with `comment` attributes and/or tags, to enable
tools which transform the XML without loss of information.
* Replace `validextensionstructs` with `structextends`, which is tagged in
the child structure instead of the parent. This makes it slightly
simpler to add new structs to the XML, causes fewer merge conflicts, and
the information is kept localized to the extension structures where it
belongs. The old `validextensionstructs` attributes will be retained
until we're certain this doesn't cause problems with known consumers of
+vk.xml+.
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